Hello, I'mThanh Dat

Software Engineer — Java Backend → Full-Stack

Progressed from Java backend development to full-stack engineering, building and maintaining applications using Java, Python, React, and MySQL.

1. Full-Stack Developer (Python & React)

   • Built end-to-end features across Python and React applications, collaborating with cross-functional teams to troubleshoot production issues and maintain reliable application behavior.
   • Integrated OpenAI and Google Gemini APIs for invoice OCR, document processing, speech-to-text, and multilingual translation.
   • Developed and enhanced Retrieval-Augmented Generation (RAG) workflows, focusing on knowledge-base chunking, semantic retrieval, and conversational context management.

2. Java Backend Developer

   • Developed and maintained RESTful APIs and business logic for enterprise applications covering inventory management, purchasing, financial transactions, and automated workflows.
   • Optimized complex MySQL queries and stored procedures, addressing performance bottlenecks, database locking, and data consistency issues.
   • Implemented Stripe payment integrations, including subscription lifecycle management, webhook processing, and idempotency handling to prevent duplicate event processing.

Product Backend Intern

• Developed and maintained internal HR management system with admin and user portals
• Built Commitment module for workload & office management
• Optimized backend services using NestJS, Go, PostgreSQL, and NATS in Agile/Scrum workflow